修复CSS3菜单

Question

我制作了纯CSS3下拉菜单，并使用对象标记将文件插入到HTML文件中。问题是，当我将鼠标悬停在菜单上时，会出现一个滚动条。我希望菜单在悬停时重叠其下面的内容。

---

这是我的Javascript代码（忘了这部分）：

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(function($) {

  $.fn.menumaker = function(options) {
      
      var cssmenu = $(this), settings = $.extend({
        title: "Menu",
        format: "dropdown",
        sticky: false
      }, options);

      return this.each(function() {
        cssmenu.prepend('<div id="menu-button">' + settings.title + '</div>');
        $(this).find("#menu-button").on('click', function(){
          $(this).toggleClass('menu-opened');
          var mainmenu = $(this).next('ul');
          if (mainmenu.hasClass('open')) { 
            mainmenu.hide().removeClass('open');
          }
          else {
            mainmenu.show().addClass('open');
            if (settings.format === "dropdown") {
              mainmenu.find('ul').show();
            }
          }
        });

        cssmenu.find('li ul').parent().addClass('has-sub');

        multiTg = function() {
          cssmenu.find(".has-sub").prepend('<span class="submenu-button"></span>');
          cssmenu.find('.submenu-button').on('click', function() {
            $(this).toggleClass('submenu-opened');
            if ($(this).siblings('ul').hasClass('open')) {
              $(this).siblings('ul').removeClass('open').hide();
            }
            else {
              $(this).siblings('ul').addClass('open').show();
            }
          });
        };

        if (settings.format === 'multitoggle') multiTg();
        else cssmenu.addClass('dropdown');

        if (settings.sticky === true) cssmenu.css('position', 'fixed');

        resizeFix = function() {
          if ($( window ).width() > 768) {
            cssmenu.find('ul').show();
          }

          if ($(window).width() <= 768) {
            cssmenu.find('ul').hide().removeClass('open');
          }
        };
        resizeFix();
        return $(window).on('resize', resizeFix);

      });
  };
})(jQuery);

(function($){
$(document).ready(function(){

$(document).ready(function() {
  $("#cssmenu").menumaker({
    title: "Menu",
    format: "multitoggle"
  });

  $("#cssmenu").prepend("<div id='menu-line'></div>");

var foundActive = false, activeElement, linePosition = 0, menuLine = $("#cssmenu #menu-line"), lineWidth, defaultPosition, defaultWidth;

$("#cssmenu > ul > li").each(function() {
  if ($(this).hasClass('active')) {
    activeElement = $(this);
    foundActive = true;
  }
});

if (foundActive === false) {
  activeElement = $("#cssmenu > ul > li").first();
}

defaultWidth = lineWidth = activeElement.width();

defaultPosition = linePosition = activeElement.position().left;

menuLine.css("width", lineWidth);
menuLine.css("left", linePosition);

$("#cssmenu > ul > li").hover(function() {
  activeElement = $(this);
  lineWidth = activeElement.width();
  linePosition = activeElement.position().left;
  menuLine.css("width", lineWidth);
  menuLine.css("left", linePosition);
}, 
function() {
  menuLine.css("left", defaultPosition);
  menuLine.css("width", defaultWidth);
});

});


});
})(jQuery);


**Here is my CSS code (important!):**

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@import url(http://fonts.googleapis.com/css?family=Open+Sans);
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #menu-button {
  margin: 0;
  padding: 0;
  border: 0;
  list-style: none;
  line-height: 1;
  display: block;
  position: relative;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
#cssmenu:after,
#cssmenu > ul:after {
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0;
}
#cssmenu #menu-button {
  display: none;
}
#cssmenu {
  width: auto;
  font-family: 'Oxygen', sans-serif;
  line-height: 1;
  background: #83d99e;
    overflow: hidden;
}
#menu-line {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  background: #009ae1;
  -webkit-transition: all 0.25s ease-out;
  -moz-transition: all 0.25s ease-out;
  -ms-transition: all 0.25s ease-out;
  -o-transition: all 0.25s ease-out;
  transition: all 0.25s ease-out;
}
#cssmenu > ul > li {
  float: left;
}
#cssmenu.align-center > ul {
  font-size: 0;
  text-align: center;
}
#cssmenu.align-center > ul > li {
  display: inline-block;
  float: none;
}
#cssmenu.align-center ul ul {
  text-align: left;
}
#cssmenu.align-right > ul > li {
  float: right;
}
#cssmenu.align-right ul ul {
  text-align: right;
}
#cssmenu > ul > li > a {
  padding: 20px;
  font-size: 13.1px;
  text-decoration: none;
  text-transform: uppercase;
  color: #000;
  -webkit-transition: color .2s ease;
  -moz-transition: color .2s ease;
  -ms-transition: color .2s ease;
  -o-transition: color .2s ease;
  transition: color .2s ease;
 
}
#cssmenu > ul > li:hover > a,
#cssmenu > ul > li.active > a {
  color: #009ae1;
}
#cssmenu > ul > li.has-sub > a {
  padding-right: 25px;
}
#cssmenu > ul > li.has-sub > a::after {
  position: absolute;
  top: 21px;
  right: 10px;
  width: 4px;
  height: 4px;
  border-bottom: 1px solid #000000;
  border-right: 1px solid #000000;
  content: "";
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
  -webkit-transition: border-color 0.2s ease;
  -moz-transition: border-color 0.2s ease;
  -ms-transition: border-color 0.2s ease;
  -o-transition: border-color 0.2s ease;
  transition: border-color 0.2s ease;
}
#cssmenu > ul > li.has-sub:hover > a::after {
  border-color: #009ae1;
}
#cssmenu ul ul {
  position: absolute;
  left: -9999px;
}
#cssmenu li:hover > ul {
  left: auto;
}
#cssmenu.align-right li:hover > ul {
  right: 0;
}
#cssmenu ul ul ul {
  margin-left: 100%;
  top: 0;
}
#cssmenu.align-right ul ul ul {
  margin-left: 0;
  margin-right: 100%;
}
#cssmenu ul ul li {
  height: 0;
  -webkit-transition: height .2s ease;
  -moz-transition: height .2s ease;
  -ms-transition: height .2s ease;
  -o-transition: height .2s ease;
  transition: height .2s ease;
}
#cssmenu ul li:hover > ul > li {
  height: 32px;
}
#cssmenu ul ul li a {
  padding: 10px 20px;
  width: 160px;
  font-size: 12px;
  background: #333333;
  text-decoration: none;
  color: #dddddd;
  -webkit-transition: color .2s ease;
  -moz-transition: color .2s ease;
  -ms-transition: color .2s ease;
  -o-transition: color .2s ease;
  transition: color .2s ease;
}
#cssmenu ul ul li:hover > a,
#cssmenu ul ul li a:hover {
  color: #ffffff;
}
#cssmenu ul ul li.has-sub > a::after {
  position: absolute;
  top: 13px;
  right: 10px;
  width: 4px;
  height: 4px;
  border-bottom: 1px solid #dddddd;
  border-right: 1px solid #dddddd;
  content: "";
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
  -webkit-transition: border-color 0.2s ease;
  -moz-transition: border-color 0.2s ease;
  -ms-transition: border-color 0.2s ease;
  -o-transition: border-color 0.2s ease;
  transition: border-color 0.2s ease;
}
#cssmenu.align-right ul ul li.has-sub > a::after {
  right: auto;
  left: 10px;
  border-bottom: 0;
  border-right: 0;
  border-top: 1px solid #dddddd;
  border-left: 1px solid #dddddd;
}
#cssmenu ul ul li.has-sub:hover > a::after {
  border-color: #ffffff;
}
@media all and (max-width: 768px), only screen and (-webkit-min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min--moz-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (-o-min-device-pixel-ratio: 2/1) and (max-width: 1024px), only screen and (min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min-resolution: 192dpi) and (max-width: 1024px), only screen and (min-resolution: 2dppx) and (max-width: 1024px) {
  #cssmenu {
    width: 100%;
  }
  #cssmenu ul {
    width: 100%;
    display: none;
  }
  #cssmenu.align-center > ul,
  #cssmenu.align-right ul ul {
    text-align: left;
  }
  #cssmenu ul li,
  #cssmenu ul ul li,
  #cssmenu ul li:hover > ul > li {
    width: 100%;
    height: auto;
    border-top: 1px solid rgba(120, 120, 120, 0.15);
  }
  #cssmenu ul li a,
  #cssmenu ul ul li a {
    width: 100%;
  }
  #cssmenu > ul > li,
  #cssmenu.align-center > ul > li,
  #cssmenu.align-right > ul > li {
    float: none;
    display: block;
  }
  #cssmenu ul ul li a {
    padding: 20px 20px 20px 30px;
    font-size: 12px;
    color: #000000;
    background: none;
  }
  #cssmenu ul ul li:hover > a,
  #cssmenu ul ul li a:hover {
    color: #000000;
  }
  #cssmenu ul ul ul li a {
    padding-left: 40px;
  }
  #cssmenu ul ul,
  #cssmenu ul ul ul {
    position: relative;
    left: 0;
    right: auto;
    width: 100%;
    margin: 0;
  }
  #cssmenu > ul > li.has-sub > a::after,
  #cssmenu ul ul li.has-sub > a::after {
    display: none;
  }
  #menu-line {
    display: none;
  }
  #cssmenu #menu-button {
    display: block;
    padding: 20px;
    color: #000000;
    cursor: pointer;
    font-size: 12px;
    text-transform: uppercase;
  }
  #cssmenu #menu-button::after {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    display: block;
    width: 15px;
    height: 2px;
    background: #000000;
  }
  #cssmenu #menu-button::before {
    content: '';
    position: absolute;
    top: 25px;
    right: 20px;
    display: block;
    width: 15px;
    height: 3px;
    border-top: 2px solid #000000;
    border-bottom: 2px solid #000000;
  }
  #cssmenu .submenu-button {
    position: absolute;
    z-index: 10;
    right: 0;
    top: 0;
    display: block;
    border-left: 1px solid rgba(120, 120, 120, 0.15);
    height: 52px;
    width: 52px;
    cursor: pointer;
  }
  #cssmenu .submenu-button::after {
    content: '';
    position: absolute;
    top: 21px;
    left: 26px;
    display: block;
    width: 1px;
    height: 11px;
    background: #000000;
    z-index: 99;
  }
  #cssmenu .submenu-button::before {
    content: '';
    position: absolute;
    left: 21px;
    top: 26px;
    display: block;
    width: 11px;
    height: 1px;
    background: #000000;
    z-index: 99;
  }
  #cssmenu .submenu-button.submenu-opened:after {
    display: none;
  }
}


And here is my HTML:

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<!doctype html>
<html lang=''>
<head>
   <meta charset='utf-8'>
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="stylesheet" href="navStyle.css">
   <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
   <script src="navScript.js"></script>
   <title>Navigation Panel</title>
</head>
<body>

<div id='cssmenu'>
<ul>
   <li><a href='#'>Home</a></li>
   <li class='has-sub'><a href='#'>Bases and Folds</a>
      <ul>
         <li class='has-sub'><a href='#'>Bases</a>
            <ul>
                <li> <a target="_top" href="http://petagami.com/basesfolds/square.html"> Square Base</a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/waterbomb.html"> Waterbomb Base </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/kite.html"> Kite Base </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/fish.html"> Fish Base </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/frog.html"> Frog Base </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/diamond.html"> Diamond Base </a></li>
            </ul>
         </li>
         <li class='has-sub'><a href='#'>Folds</a>
            <ul>
                <li> <a target="_top" href="http://petagami.com/basesfolds/mountain.html"> Mountain Fold </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/valley.html"> Valley Fold </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/petal.html"> Petal Fold </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/reverse.html"> Reverse Fold </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/outreverse.html"> Oustide-Reverse Fold </a></li>
                <li> <a target="_top" href="http://petagami.com/basesfolds/blintz.html"> Blintz Fold </a></li>
            </ul>
         </li>
      </ul>
   </li>
   <li><a href="http://petagami.com/easy.html" target="_top">  Easy Origami </a></li><li>
        <a href="http://petagami.com/modular.html" target="_top">  Modular Origami </a></li><li>
        <a href="http://petagami.com/animals.html" target="_top">  Origami Animals <br> </a></li><li>
        <a href="http://petagami.com/birds.html" target="_top"> Origami Birds </a></li><li>
        <a href="http://petagami.com/index.html" target="_top"> Model Index </a></li><li>
        <a href="http://petagami.com/tradtional.html" target="_top"> Traditional Origami </a></li><li>
        <a href="http://petagami.com/marksym.html" target="_top"> Markings and Symbols </a></li><li>
            
</ul>
</div>

</body>
<html>

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Answer 1

将overflow: visible;提供给cssmenu